Preventing incrustation in steam boilers



- P. H. VANDER WEYD'E.

PREVENTING INGRUSTATION IN STEAM BOILERS.

No. 62,093. 1 N Pa,tentedPeb.1Z,1867.

Ina n72? gutter! tstzs igsrtrntiffim P. VAN DER WEYDE, 0F PHILADELPHIA, PENNSYLVANIA. Letters Patent No. 62,093, dated February 12, 1867. i

Gite fitlgtttlt rtitttrt it in tlgest letters $21M mm mating part at the same.

Be it known that I, P. H. YANDER WEYDE, of the city-and county of Philadelphia, State of Pennsylvania, have discovered the cause whereby steam boilers may be protected from incrustation by electric conduction, and that I consequently have been able to simplify the mysterious arrangement lately patented, and intended to accomplish this purpose, dcpri ring this arrangement of all unnecessary additions, and reducing it to a few simple inverted lightning-rods My discovery is, that tln solid particles of the saltsof lime, baryta, magnesia, soda, potasli, &c., when previously dissolved in water, -nd rapidly deposited from their solution by heat, will be positive (+3 electric,

and the water negative el :tric. If, therefore, we are able to communicate to the bottom of'a steam boiler an equal small amount of posi ive electricity, it will repel any positively charged deposit, as two bodies charged with similar electriciti will repel one another. Fortunately we may obtain this positive electricity from the steam above the watt in the boiler, as it is well known that vapor of water containing any'solution of salt will also be positive tq-feleetric; .all we have todo, there 'ore, is to place in this steam Jor vapor a number of small inverted lightning-rods, attached to the top of the boiler, and projecting for several inches downward in the steam room.

The following is a description of this so very simple arrnngement'which will enable others to make and use the invention. v

a b c d is the steam boiler, a bf e the water, andf e d c the steam room. In the latterare a number of rods mn 11m attached to the top; they are of different lcngthiand pointed at their lower extreinitypthey will collect the positive electricity of the steam and conduct it to the whole surface-of the boiler,=which positive electric charge will at its bottom be discharged in thewater, repel there the positive electric deposit, preventing it from settling, and keep it suspended in the water, so that it occasionally may be removed by being blown oifi That the salts deposited from a solution are positive electric, has been also verified by Pouillet (see Annalesde O/timz'c et ale Physique, second series, tome xxxvi, page 5,)-and that the vapor or steam is charged with the some electricity, is also found by Peltier, (see the same work, third series, tome iv, page 144,} and further in Daguin Physique, tome ii, page 555.

I disclaim any conductor, suspended or not by isolated attachments, this being evidently unnecessary. I disclaim a conductor armed at one end with steel points, magnetized or not magnetized, this being not only useless, but absurd; but what I claim, and wish to secure by Letters Patent, is-

The attachment, within the upper part of the steam room of a boiler, of a number of short rods, resembling small inverted straight or curved lightnii'ig-rods, or their equivalents, intended to carry the positive electricity of the steam to the bottom of the boiler, where it, discharging in the water, repels the electro-positivc deposits, preventing them from settling, and thus protects the boiler from inerustation. i

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

- P. H. VANDER WEYDE,

Witnesses LOUIS D. RONCl-IRAY, J. W. LASSEHHE. 

